Crushing-mill.



T. J. STURTEVANT.

GRUSHING MILL.

APPLICATION FILED MAY 16. 1911.

Pand sept. 2.1913.

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WIT/v E5 gj@ T. J. STURTEVANT.

CRUSHING MILL. l APPLIOATION FILED 11u16, 1911.

1,972,053?. Patented Sept. 2, 1913.

4 SHEETS-SHEET 2.

fforne,

T. J. STURTEVANT.

ORUSHING MILL.

APPLICATION FILED 11u16, 1911.

Patented Sept. 2, 1913.

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. J y M7 T. J. STURTEVANT.

CRUSHING MILL.

APPLIcATIoN FILED Mule, 1911.

l ,072,057, Patented Sept. 2, 1913.

4 SHEETS-'SHEET 4.

coLuMnlA PLANOURNPH co..w.\sMlNa1-0N. D. C.

TED @STATE-s @maar emes THOMAS JOSEPH STURTEVANT, OF WELLESLEY,MASSACHUSETTS, ASSIG-NOR TO STURTEVANT MILL COMPANY, A CORPORATION OFMAINE.

CRUSHING-MILL.

Specication of Letters Patent.

Patented Sept. 2, 1913.

Application :filed May 16, 1911. Serial No. 627,598.

To all 'whom t may concern Be it known that I, THOMAS J. S'rUn'rE-vAN'r, a citizen of the United States, residing at Wellesley, in thecounty of Norfolk and State of Massachusetts, have invented ordiscovered certain new and useful Improvements in Crushing-Mills, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to certain improvements on the form of crushingmill shown and described in my Patent No. 988,403, granted April 4t,1911, and in the operation of which the material is crushed betweenrotating crushing disks carried by shafts one of which is within theother, and the axes of which are inclined to or out of line with eachother, so that when the machine is running certain parts of said diskswill be constantly approaching each other while t-he diametricallyopposite parts of said disks will be constantly receding from eachother, thereby causing an opening and closing crushing action of saiddisks as they rotate. In the present improved crushing mill, as in themill of my said patent, the eccentric bearing for the inner shaft iscaused to rotate in a direction opposite to the rotation of the shaftscarrying the crushing disks, and preferably at a higher speed than thespeed of rotation of said shafts, for the purpose of causing acomparatively rapid opening and closing crushing act-ion of the diskswhile they may be rotating at a relatively low rate of speed, therebyavoiding the objections incidental to a high rate of speed of rotationof the crushing disks. In the present improved crushing mill therotating shafts and the rotating` eccentric bearing are driven from asingle pulley, through suitable gearing, instead of being driven byseparate pulleys, as in the mill of my said patent, the improvedconstruction in the present case thus doing away with one driving beltand presenting many other mechanical a vantages, as will hereinafterappear.

In the accompanying drawings Figure 1 is a longitudinal section of acrushing mill embodying the present invention, with spurgear drivingmechanism, and Fig. 2 is an end view thereof looking from the right ofFig. 1. Fig. 3 is a longitudinal section of a mill embodying thepresentinvention with bevel gear driving mechanism, and Fig. 4; 1s asectional view of the same on the line 1 -4l, Fig. 3. Figs. 5 and G aredetail views to illustrate the bayonet joint connection of one of thecrushing disks with its carrying head.

Iteferring to the drawings, 12 denotes a suitable casing frame orsupport affording bearings for the hollow shaft 13 to the enlarged headportion 14 of which is bolted a spider ring 15 to which is attached,preferably by a screw threaded connection, as shown, a head 16 carryingthe outer rotating crushing disk 17. Incloscd within the` hollow shaft13 is an inner shaft 18 one end of which is journaled in an eccentricbearing 19; and interposed between the enlarged head portion 14 of thehollow shaft 13 and the head portion 2O shrunk on the outer end of theshaft 1S, is preferably interposed a bearing piece 21. 'lhc adjacentparts of the said head portions 14.- and 2O of said shafts arepreferably formed to afford a ball and socket bearing which takes thedirect strain of the crushing disks. Attached to the head 20, in anysuitable manner, preferably by bayonet joint connect-ions, is the innercrushing disk 22, which cooperates with the outer crushing disk 17. Theouter disk 1.7 may also be attached to the head 16 by a bayonet jointconnection, and in such case both disks may be attached to the heads orparts by which they are carried without bolts.

The eccentric bearing 19 comprises a sleeve of iron or steel withsuitably attached Babbitt metal portions engaging the inner and outershafts, the said sleeve having a head portion 23 to which is secured agear ring 24: meshing with an idler gear 25 supported in suitablebearings in the easing part 12 and meshing with a gear wheel 2G attachedto a driving shaft 27 provided with a suitable belt pulley 28. The shaft27 is provided with a pinion 29 meshing with a gear wheel 30 attached tothe hollow shaft 13, so that said shaft will be driven from the saidbelt pulley 28 and in a direction opposite to the direction of rotationof the eccentric sleeve 19 which is also driven from the said beltpulley 28 through the shaft 27 and the gearing just described.

The shaft 1S is rotated with the outer Vthe inner conveX- end of whichis seated in a shaft 13 through the friction Vresult-ing from thematerial gripped between the Vcrushing disks 17 and 22, the frictionallconnectionbetween said shafts at the ball and socket bearing betweenthe heads 14 and 2O on the outer and inner shafts, respectively, also v.,to. be crushed 1s fed to the crushing disks, 1s

. connected with a front part or cover 46 prot vided with arms 47through which,by means of suitable clamping bolts 48, the said covertending to rotate the said inner shaft with. the outer shaft. Therotating crushing disks are inclosed within the casing31 which ispreferably provided with a lining 32 which will receive the impact ofthe crushed material centrifugally discharged from thel crushing disksVthrough the spider 15.

Any shifting or endwise movement of the; eccentric bearing 19 relativeto the shaft 18. is prevented by the thrust collar 33 screwed onto thethreaded end of said Shaft and, abutting against a shoulder formed onther head portion 23 of the said bearing. This; thrust collar 33 alsoserves to hold the ball and socket head portions' of both shafts incontact, a-nd alsoresists, through the thrust, bearing 34 abuttingagainst the head por- 'tion 23 of the eccentric bearing, any end-` wisemovement of the outer shaft 13 relativery to the inner shaft 18. f

Bearing against the outerface of the headA 23 of the eccentric bearing19 is an oil cap or cover 35 having a central perforatiom and attachedtothe outer portion ofthe casing or frame 12, adjacent tov said` oil capor cover 35, is a hollow plate or cap 36 having a central recess inwhich is fitted a hollowl plunger 3-7 having a concave innery endreceiving the convex outer end of a tube 38 concave recess in the oilca-p orV cover 35. The

lplunger 38 is pressed inward by a spiral spring 39. This constructionprovides a somewhat fiexible or jointed duct forV the admission of oilto the oil cap or cover 35 from which the oil will work or be forcedinward to lubricate the bearings of the shafts and of the eccentricsleeve, the surplus or overflowing oil being received in an oilreceptacle or tank 40 formed by the casing or frame of the machine. Theflexible or jointed duct referred to accommodates itself to movements ofthe rotating parts, and still preserves tight joints. The hollow plateor cap 36 is connected byva pipe 41 with anl oil pump 42 driven. by abelt 43 from a pulley 44 mounted on the drivingV sha-ft 27, the chamberof thev pump 42 communicating with the oil chamber o r receptacle 40 insuch a manner as to take up the waste oil received in the chamber ofsaidv receptacle or tank and return it to the oil cap orcover 35. Arsthe gears 24 and 30 will extend into thel oil receptacle 40, below theoil level, they will Jthe mill will be lubricated by virtue ofthe oilcirculation afforded by the oil pump and shafts, is preferably madedust-proof and oil-tight.

The hopper 45, from which the material may be att-ached at both sides tohinge pins 49 in such a manner that by loosening or removing theclamping bolts and coperatling caps at one side ofsaid` front ypart orcover the latter may be swung like a door, in either direction, when itis desiredfto obtain access to the crushing disks or other parts housedby said front part or cover. The hopper and its inwardly extending spoutis preferably mounted on its support in such a manner that it may beadjusted in or out to follow the adjustment of theV outer crushingV disk17v permitted by the screwthreaded connection of the ring 16, supportingsaid disk, with the spider 15. p

1n thef'orm of mill' shown iny Figs'. 3 and 4 the shaft lf3 is driven!by a bevel gear ,-50 meshing with a bevel pinion 51 carriedby a drivingshaft 52 having a'belt pulley 53, the

said bevel pinion 51 also meshing with a bevel gear 54 connected withthe head 23 of the eccentric bearing 19. With the exception of thisdriving mechanism the construction and general operation of the millshown in Figs. 3 and 41 are the same as in the form of mill shown inFigs. 1 and 2.

Referring to Fig. 1, it will be seen that the drivingpulley 28 isconnected with the shaft 27 throughy the hub 55 bymeans of a breakingpiece or pin 56 engaging an arm 57 on the said hub, the latter being.-splined to the shaft, while the belt pulley 28fisloose thereon. The pin56, while strong-enough to drive the mill. under ordinaryV conditions,is not strong enough to resist such excessive strain as would be likelyto damage the mill, andi therefore if any unusual resistance occurs,such as is.y likely tov cause breakage of any of the parts of the mill,the said pin 56. or arm 57 will break, and thus disconnect the powerfrom the driving shaft 27. lnI the construction shown in Fig. 44 theconnection of the driving pulley 53 with. the shaft 52 is similar to.that just described with reference to Fig. 1, the connecting partsbeingindicatedy by the same reference numerals.

l/Vhile i-t is pref-erred' tor rotate the eccen- ,Y

tric bearing 19 in a direction. opposite the direction of rotation ofthe shafts carrying the crushing disks, it will be understood that theinvention is not necessarily limited to a construction effecting thisresult. In thev construction shownzin. Fig. 1. the eccenztric sleevebearing is rotated in opposition to the direction of rotation of thedisk-carrying shafts, and at a higher rate of speed, while in theconstruction shown in Figs. 3 and 4 the speed of opposite rotation ofthe eccentric bearing will be the same as the speed of rotation of thedisk-carrying shafts, as will be understood from the gearing shown. Inpractice the speed of the hollow and solid shafts, with their attacheddisks, is made as slow as possible, consistent with the propercentrifugal discharge of the material in process of reduction, while theeccentric sleeve bearing may be rotated in the opposite direction at aspeed limited only by considerations of wear and tear and cool running.

From the foregoing it will be understood that the present inventionprovides certain improvements over the form of mill shown and describedin my Patent No. 988,403, hereinbefore referred to, by which the shaftscarrying the crushing disks and the rotating eccentric bearing may bedriven from a single belt through a single driving pulley; and it willalso be understood that the lubricating means described affordsfacilities for keeping the bearings of the mill thoroughly lubricatedWithout waste of the lubricating oil which can be used over and overagain.

The bayonet joint connections of the crushing disks 17 and 22 with theirrespective carrying heads 16 and 20 may be effected by providing saiddisks, at their backs, with spaced hooked lugs 58 which, in mounting oneof said disks, are first brought into register with spaces betweenseparated lugs or projections 59 on the heads 1G and 20, and then bygiving the disk a partial rotation the said hooked lugs 58 are tightlywedged against the inclined faces of the lugs or projections 59 so as tolock the disk in place. The inclined faces of the lugs or projections 59are so arranged relative to the direct-ion of rotation of the crushingdisks, that, in the operation of the mill, there will be a tendency totighten the grip of the engaged lugs, and thus hold the parts securelyengaged. This construction provides a readily mountable and dismountableconnection of the crushing disks with their earrying-heads.

Having thus described my invention I claim and desire to secure byLetters Patent:

1. In a crushing mill, the combination with two crushing disks, of innerand outer shafts by which said disks are carried, an eccentric bearingfor said inner shaft, a driving pulley, and means, including gearing,between said pulley and said bearing,

for rotating the latter independently of said shafts.

2. In a crushing mill the combination with two crushing disks, of innerand outer shafts by which said disks are carried, a rotating eccentricbearing for the said inner shaft, a single driving pulley, and gearconnections, driven from said pulley, for rotating said bearing and saidouter shaft independently of eacli other.

3. In a crushing mill, the combination with two crushing disks, of innerand outer shafts by which said disks are carried, a driving shaftprovided with a pulley, a rotating eccentric bearing for said innershaft, and gearing connecting said driving shaft with said outer shaftand said eccentric bearing and arranged to cause said shaft and bearingto rotate in opposite directions.

4f. In a crushing mill, the combination with two rotating crushingmembers, of inner and outer shafts by which said members are carried, aneccentric sleeve interposed between said shafts, a thrust collar on theinner shaft and by which said eccentric sleeve is held fromlongitudinal" movement, said eccentric sleeve having a head or flangedpart opposing endwse movement of the said outer shaft.

5. In a crushing mill, the combination with two rotating crushingmembers, and inner and outer shafts by which said members are carried,of an eccentric bearing interposed between said shafts and provided withan annular flange which opposes endwise movement of said outer shaft,and a thrust collar screw-threaded to the end of said inner shaftI andabutting against said eccentric bearing.

6. In a crushing mill, the combination with two crushing disks, of innerand outer shafts by which said disks are carried, an eccentric sleevebearing for said inner shaft, a bevel gear for driving said eccentricsleeve, a bevel gear for driving said outer shaft, and a single pinionto mesh with both bevel gears.

7. In a crushing mill, the combination with two crushing disks, of innerand outer shafts by which said disks are carried, an eccentric bearingfor said inner shaft, driving means, and means, including gearing,between said driving means and said bearing, for rotating the latterindependently of said shafts.

In testimony whereof I affix my signature, in presence of two witnesses.

THOMAS JOSEPH S'lUIt'lEVAN'l.

Witnesses: g

W. V. Ennis, W. T. Dormi.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

